Scientists working at NASA’s Goddard Space Flight Center in Greenbelt, Md., have developed plans for giant telescope mirrors on the Moon using lunar dust.

The capabilities of a 50-meter telescope on the Moon stagger the
imagination, according to NASA. With a stable platform, and no
atmosphere to absorb or blur starlight, the monster scope could record
the spectra of extra solar terrestrial planets and detect atmospheric
biomarkers such as ozone and methane. Two or more such telescopes
spanning the surface of the Moon can work together to take direct
images of Earth-like planets around nearby stars and look for
brightness variations that come from oceans and continents.